You may choose not to untap The Pandorica during your untap step. , : Untap another target nonland permanent, then it phases out. It can’t phase in for as long as The Pandorica remains tapped. When The Pandorica becomes untapped or leaves the battlefield, that permanent phases in. Activate only as a sorcery.
Abilities that trigger when a creature becomes tapped won't trigger when a creature phases in tapped. (This might happen if the creature in question has one or more stun counters on it.)
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wotc
Any one-shot effects that are waiting "until [this] leaves the battlefield," won't happen when a permanent phases out.
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wotc
Choices made for permanents as they entered the battlefield are remembered when they phase in.
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wotc
Any continuous effects with a "for as long as" duration ignore phased-out objects. Any such effects will expire if their conditions are no longer met after ignoring the phased-out objects.
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wotc
Each Aura and Equipment attached to a permanent that's phasing out also phases out. They will phase in with that permanent and still be attached to it. Similarly, permanents that phase out with counters phase in with those counters.
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wotc
While a permanent is phased out, it's treated as though it doesn't exist. It can't be the target of spells or abilities, its static abilities have no effect on the game, its triggered abilities can't trigger, it can't attack or block, and so on.
13-10-2023
wotc
Phasing out doesn't cause any "leaves the battlefield" abilities to trigger. Similarly, phasing in won't cause any "enters the battlefield" abilities to trigger.
Random a card of Magic: The Gathering (MTG), but you can also roll the D20 dice, random a Planeswalker, have fun with the random rules and more.